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Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Impact Tests
Impact tests are of considerable importance as an indication ...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

The material used for all gears on the Liberty engine was sel...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

Silicon prevents, to a large extent, defects such as gas bubb...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

There is no mystery or secret about the proper annealing of d...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Annealing Work
With the exception of several of the higher types of alloy s...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

An Automatic Temperature Control Pyrometer


Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.

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Previous: Brown Automatic Signaling Pyrometer

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